Electrochemical technology is very efficient in the removal of pollutants contained in highly loaded effluents. However, the efficiency decreases importantly when the concentration of the pollutants decreases, because of the diffusion control of the process kinetics. This decrease in the efficiency can be prevented by stimulating the in-situ  production of oxidants during the treatment. Because of that, in the recent years, there is an increasing interest in the synthesis of oxidant such as ozone, chlorine dioxide, hydrogen peroxide or peroxospecies (persulfates, percarbonates, peroxofosfates). This work describes the most recent progress in the synthesis of these oxidants, including the design of pressurized electrochemical cells, the use of diamond electrodes and the combination of the electrochemical process with oxidants activation processes such as the irradiation of UV light or the application of ultrasounds. Also, it is decribed how this technology can be used not only for the treatment of water and wastewater but also for the treatment of gaseous streams polluted with volatile organic compounds with the use of novel electro-scrubbers.

Electrochemical prodcution of oxidants for the removal of emergent pollutants from water and wastewater

ACS Fall 2021

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